Sixty-six people - dead in an instant. What kind of animals would do such a thing? Cui bono? And who has the means and the opportunity?

No group claimed responsibility for the attack. But car bombings and suicide attacks against Shiite civilians have often been blamed on al-Qaida in Iraq, which al-Zarqawi led until he was killed in a U.S. airstrike June 7.

[BUT] Al-Zarqawi's death has not brought a halt to the attacks. At least 631 Iraqi civilians and security forces were killed between June 8 and June 30, according to Associated Press figures. That includes 25 people killed Monday in a bicycle bombing in Baqouba.

Where do these people get their seemingly endless supply of explosives?